My 2-year-old has 100+ words but isn't combining them?

Not necessarily. While many 24-month-olds begin using two-word phrases, it is a developmental range rather than a strict deadline. Since your child has a robust vocabulary of over 100 words, they have already mastered the difficult task of building a word bank. The ability to combine those words into sentences often emerges between ages 2 and 3. As long as your child is imitating you, following simple directions, and not showing significant frustration, they are likely just taking their own time to master the next step of language development.